Using the analogy of a kitchen to show the process of Gene Expression.
Gene Expression Analogy by Faith A
The cookbook binding (i.e nucleus) contains many different recipes (i.e chromosome) and a specific recipe such as a chocolate chip cookie recipe (i.e DNA) would be found within the book binding. The book (i.e. nucleus) is surrounded by the kitchen (i.e cytoplasm).
The chocolate chip cookie recipe (i.e DNA) is copied onto a sheet of paper (i.e mRNA) by a pencil (i.e RNA polymerase) thereby creating a copy of itself (i.e transcription).
The copy of the original recipe (i.e mRNA) is then taken out of the book (i.e nucleus) and then placed in the kitchen (i.e cytoplasm).
The cook (i.e tRNA) then begins to transfer the first ingredient (i.e amino acid) from the kitchen (i.e cytoplasm) into the bowl (i.e ribsome). The cook (i.e tRNA) then continues to do this with the remainder of the ingredients (i.e amino acids).
After all of the ingredients (i.e amino acids) have been transferred by the cook (i.e tRNA) into the bowl (i.e ribsome) then the process (i.e translation) is stopped and the final product of cookies is produced (i.e protein).